210120111109 has 2 divisors, whose sum is σ = 210120111110. Its totient is φ = 210120111108.

The previous prime is 210120111107. The next prime is 210120111133. The reversal of 210120111109 is 901111021012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178503715009 + 31616396100 = 422497^2 + 177810^2 .

It is a cyclic number.

It is not a de Polignac number, because 210120111109 - 2¹ = 210120111107 is a prime.

It is a super-2 number, since 2×210120111109² (a number of 23 digits) contains 22 as substring.

Together with 210120111107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210120111107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060055554 + 105060055555.

It is an arithmetic number, because the mean of its divisors is an integer number (105060055555).

Almost surely, 2^210120111109 is an apocalyptic number.

It is an amenable number.

210120111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

210120111109 is an equidigital number, since it uses as much as digits as its factorization.

210120111109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 210120111109 in words is "two hundred ten billion, one hundred twenty million, one hundred eleven thousand, one hundred nine".